html {font-size: 24px;}
*, ::after, ::before {
  box-sizing: border-box;
}
html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
}
body {
  color: #444;
  font-family: Kitab;
  overscroll-behavior-y: contain;
  direction: rtl;
  max-width: 750px;
  margin: 0 auto;
}
@media print {
  section {
    page-break-after: section;
  }
}
/**/

/* Tabs */
.tabs-cont {
  overflow-y: auto;
  line-height: 1.6;
  position: relative;
}
.tabs-cont > section {
  display: none;
  transition: opacity 0.3s;
}
.tabs-cont > section.active {
  display: block;
  padding: 0.7rem 0.5rem;
}

/* Typography */
h1, h2, h3, p, ul {
  margin: 0;
}

h1 {
  text-align: center;
  font-size: 1.8em;
}

h2 {
  font-size: 1.3em;
}

h3 {
  font-size: 1.1em;
}

h2, h3 {
  margin-top: 1rem;
}

p + p {
  text-indent: 1em;
}

.tabs-cont > section {
  font-size: calc(22px * var(--size));
}

section.font-1 {
  line-height: 1.6;
}

section.font-2 {
  line-height: 1.3;
}
.font-1 h2 {
  margin-top: 0.8rem;
}

section.font-4 {
  line-height: 1.8;
}

nav#tab-bar {
  display: flex;
  justify-content: center;
}

nav#tab-bar button {
  padding: 3px 2.2vw;
  font-size: 11pt;
}

#tab-bar button.active {
  border: 2px solid #1d5aa0;
}